docs: def units_convertible(units1, units2, reftimeistime=True):
      """
      Return True if a Unit representing the string units1 can be converted
      to a Unit representing the string units2, else False.
  
      :param str units1: A string representing the units
      :param str units2: A string representing the units
      """
      try:
          u1 = Unit(units1)
          u2 = Unit(units2)
      except ValueError:
          return False
      return u1.is_convertible(u2)